bug#21302: 25.0.50; buffer coding

bug#21302: 25.0.50; buffer coding

[Daniel Wu]

a long story on `buffer coding' when non-ascii characters are involved in
a path.

it happens with cider-mode, and i don't know how to repeat this issue
without using cider-ode, so please have a look at:
http://github.com/clojure-emacs/cider/issues/1224

i've tried to report this issue to the maintainers of cider-mode, and
they decided it's an emacs bug and recommended me to report to you.



In GNU Emacs 25.0.50.1 (x86_64-apple-darwin13.4.0, NS appkit-1265.21 Version 10.9.5 (Build 13F1096))
of 2015-08-08 on builder10-9.porkrind.org
Windowing system distributor `Apple', version 10.3.1348
Configured using:
`configure --with-ns '--enable-locallisppath=/Library/Application
Support/Emacs/${version}/site-lisp:/Library/Application
Support/Emacs/site-lisp''

Configured features:
ACL LIBXML2 ZLIB TOOLKIT_SCROLL_BARS NS

Important settings:
  value of $LANG: en_CA.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Clojure

Minor modes in effect:
  cider-mode: t
  shell-dirtrack-mode: t
  diff-auto-refine-mode: t
  rainbow-delimiters-mode: t
  override-global-mode: t
  ace-pinyin-global-mode: t
  ace-pinyin-mode: t
  yas-minor-mode: t
  electric-pair-mode: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  show-paren-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  global-prettify-symbols-mode: t
  prettify-symbols-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
nREPL: Direct connection established
Connected.  A point of view is worth 80 IQ points. -Alan Kay
Read-Only mode enabled in current buffer
Read-Only mode disabled in current buffer
Read-Only mode enabled in current buffer
C-c C-g is undefined
Quit [3 times]
funcall-interactively: Buffer is read-only: #<buffer *cider-repl parker*>
Read-Only mode disabled in current buffer
History item: 0

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message dired rfc822 mml mml-sec
mm-decode mm-bodies mm-encode mailabbrev gmm-utils mailheader sendmail
mail-utils mule-diag markdown-mode spinner pkg-info url-http url
url-proxy url-privacy url-expand url-methods url-history mailcap
url-auth mail-parse rfc2231 rfc2047 rfc2045 ietf-drums url-cookie
url-domsuf url-util url-parse url-gw url-vars json lisp-mnt epl pp
network-stream nsm starttls tls cider tramp-sh cider-debug
cider-browse-ns cider-inspector cider-mode cider-repl cider-eldoc
cider-interaction compile arc-mode archive-mode cider-overlays cider-doc
org-table org org-macro org-footnote org-pcomplete org-list org-faces
org-entities noutline outline org-version ob-emacs-lisp ob ob-tangle
ob-ref ob-lob ob-table ob-exp org-src ob-keys ob-comint ob-core ob-eval
org-compat org-macs org-loaddefs find-func cal-menu calendar
cal-loaddefs cider-test cider-stacktrace cider-client nrepl-client tramp
tramp-compat auth-source gnus-util mm-util help-fns mail-prsvr
password-cache tramp-loaddefs trampver shell pcomplete comint
format-spec queue cider-util ewoc ansi-color etags xref project eieio
byte-opt bytecomp byte-compile cconv eieio-core cl-macs thingatpt
misearch multi-isearch vc vc-dispatcher vc-git diff-mode clojure-mode
imenu rainbow-delimiters edmacro kmacro bind-key easy-mmode ace-pinyin
avy ring ace-jump-mode advice clojure-snippets java-snippets
datomic-snippets cl-extra seq cl-seq s ucs-normalize dash yasnippet
help-mode cl gv cl-loaddefs pcase cl-lib elec-pair undo-tree diff
finder-inf info package easymenu epg-config avoid paren time-date
mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel ns-win term/common-win tool-bar dnd fontset image
regexp-opt fringe tabulated-list newcomment elisp-mode lisp-mode
prog-mode register page menu-bar rfn-eshadow timer select scroll-bar
mouse jit-lock font-lock syntax facemenu font-core frame cl-generic cham
georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao
korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech
european ethiopic indian cyrillic chinese charscript case-table epa-hook
jka-cmpr-hook help simple abbrev minibuffer cl-preloaded nadvice
loaddefs button faces cus-face macroexp files text-properties overlay
sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote cocoa ns multi-tty
make-network-process emacs)

Memory information:
((conses 16 382018 18794)
(symbols 48 37319 0)
(miscs 40 183 926)
(strings 32 78094 11217)
(string-bytes 1 2320764)
(vectors 16 55161)
(vector-slots 8 995236 13130)
(floats 8 731 575)
(intervals 56 5367 0)
(buffers 976 21))

bug#21302: 25.0.50; buffer coding

[Eli Zaretskii]

> From: Daniel Wu <daniel.wu@cenx.com>
> Date: Wed, 19 Aug 2015 15:55:22 -0400
> 
> a long story on `buffer coding' when non-ascii characters are involved in
> a path.
> 
> it happens with cider-mode, and i don't know how to repeat this issue
> without using cider-ode, so please have a look at:
> http://github.com/clojure-emacs/cider/issues/1224

I'm sorry, but I see no coherent story there, at least not one that
can be understood by someone ignorant about cider-mode and clojure,
such as myself.  Is it possible to have the Emacs-related details
reported here?  For starters, how did that file name get into Emacs?
Was it typed by the user, reported by some subprocess, read by Emacs
from a file/buffer, something else?

Also, it is not clear to me on what OS the original problem happens.
Someone mentioned Windows there, someone else mentioned Linux, you are
reporting on Darwin...

> i've tried to report this issue to the maintainers of cider-mode, and
> they decided it's an emacs bug and recommended me to report to you.

I'm not quite sure I understand the details, but from what little I
could glean and guess, it looks like the offending file name is a
unibyte string, i.e. it wasn't decoded before being used.  If the file
name is received from some subprocess, then you need to decode it.

Also, people there are talking about "buffer coding" and
buffer-file-coding-system, but since this is a file name,
file-name-coding-system might be a more relevant variable.

But all this is based on guessing.  Without a clear description of
Emacs details related to this, I don't see how this could be solved,
or even attributed to Emacs core.

bug#21302: 25.0.50; buffer coding

[Glenn Morris]

Eli Zaretskii wrote:

> But all this is based on guessing.  Without a clear description of
> Emacs details related to this, I don't see how this could be solved,
> or even attributed to Emacs core.

Closing after a year.